Valles Caldera Scientific DrillingScientists met in Los Alamos,
N.M., to weigh the pros and cons of pursuing more drilling, in order to
understand climate change history at this famous geothermal location.
Fraser Goff and Jeffrey M. Heikoop

coverON
THE COVERFrom 1991 to 1995, Unzen Volcano in Nagasaki
Prefecture, Japan, violently erupted. Now geologists are drilling
into the volcano to learn more about how magma rises to the surface. This
picture of an Unzen fumarole and nearby lava was taken by Hiroshi Shimizu, professor
of seismology at Kyushu University.